Retaining wall blocks typically 12 inches deep, 8 inches tall. Need 6 inch compacted gravel base. Bury first course. Walls over 4 feet high require engineering. Backfill with gravel and install perforated drain pipe at base for drainage.
Quick Tips
- Always order 10-15% extra materials for waste
- Check local building codes before starting
- Measure twice, cut once — verify all inputs
Frequently Asked Questions
6 inch compacted gravel base. Bury first course of blocks for stability.
DIY-friendly up to 4 feet. Taller walls need professional engineering and permits.
Essential. Use gravel backfill and 4 inch perforated drain pipe at base.